The relationship between latent trait and test-taking speed is an important area of study in assessment research. In addition to contributions of such studies to psychometrics, the factors that affect both ability and speed have implications for test development and have policy consequences especially if the tests are high stakes. This study…

We determined the relative importance of the so-called approximate number system (ANS), symbolic number comparison (SNC) and verbal and spatial short-term and working memory (WM) capacity for mathematics achievement in 1,254 Grade 2, 4 and 6 children. The large sample size assured high power and low false report probability and allowed us to…

Children with a rich home literacy environment generally show better reading comprehension. For children in the higher grades of primary school, this relation is thought to be indirect. We propose a model in which this relation ran via children's higher order language and cognitive skills (i.e., expressive verbal ability and mentalizing ability)…

The present study explored the environmental and genetic etiologies of the longitudinal relations between prereading skills and reading and spelling. Twin pairs (n = 489) were assessed before kindergarten (M = 4.9 years), post-first grade (M = 7.4 years), and post-fourth grade (M = 10.4 years). Genetic influences on five prereading skills (print…

There is growing evidence supporting the importance of executive functions, and specifically working memory updating (WMU), for children's academic achievement. This study aimed to assess the specific contribution of updating to the prediction of academic performance. Two updating tasks, which included different updating components, were…

We examined the developmental relations between knowledge of reading strategies and reading comprehension in a longitudinal study of 312 Dutch children from the beginning of fourth grade to the end of fifth grade. Measures for reading comprehension, reading strategies, reading fluency, vocabulary, and working memory were administered. A structural…

Many recent studies have aimed to demonstrate that specific types of reading comprehension depend on different underlying cognitive abilities. In these studies, it is often implicitly assumed that reading comprehension is a multidimensional construct. The general aim of this study was to examine the dimensionality of a large pool of reading…

This longitudinal study was conducted to determine (a) the rate of co-occurrence of reading disabilities (RDs) in a writing disability (WD) population of students followed from first grade to fourth grade and (b) the cognitive burden that is assumed by having a WD and a RD (WD + RD). The sample included 137 first-grade students from a single…

The present research explored the relation between socio-cognitive skills, as Theory of Mind and affective empathy, social behaviour, attachment style and scholastic success in children, aged from 8 to 11 years (N = 159; 90 females, 69 males; M[subscript age] = 9,60; DS = 0.78). Several assessment tools were administered to children on mentalizing…

The mental lexicon plays a central role in reading comprehension (Perfetti & Stafura, 2014). It encompasses the number of lexical entries in spoken and written language (vocabulary breadth), the semantic quality of these entries (vocabulary depth), and the connection strength between lexical representations (semantic relatedness); as such, it…

We present the results of an empirical test of the hypothesis that transfer of orthographic processing to reading occurs when the scripts under acquisition are written with the same unit (specifically, the same alphabet). We tested 97 Spanish-English bilingual children in Grades 4 and 7. We measured mother's education level, verbal and nonverbal…

This investigation analyzed the relation between cognitive functioning and mathematical achievement in 114 students in fourth, fifth, and sixth grades. Differences in cognitive performance were studied concurrently in three selected achievement groups: mathematical learning disability group (MLD), low achieving group (LA), and typically achieving…

The present study aimed to investigate the contribution of oral language skills, linguistic skills, and transcription skills to Chinese written composition among Grade 4 students in Hong Kong. Measures assessing verbal working memory, oral language skills, linguistic skills (i.e., syntactic skills and discourse skills), transcription skills (i.e.,…

This study investigated some of the underlying factors that may relate to and predict the reading comprehension of children in fourth through eighth grade (N = 47). A subset of these children previously had been diagnosed with autism spectrum disorders (ASD; n = 10); the remainder are classified as typically-developing (n = 37). The participants…

The purpose of this study was to examine the simple view of reading (SVR) and contributions of verbal proficiency and reading fluency to reading comprehension for fourth-, seventh- and ninth-grade readers (N = 271). The SVR explained a significant proportion of variance in reading comprehension for all grades with decreasing explained variance in…